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Martux
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Joined: 04 Feb 2005
Posts: 1917
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 Posted: Tue Mar 15, 2016 5:55 am Post subject: [SOLVED] Skylake and integrated graphics weirdness |
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Hi there.
I have zapped through journalctl and stumpled upon a message stating that the integrated graphics is missing firmware files. So I went the route and integrated them into the kernel:
i915/skl_guc_ver4.bin
i915/skl_dmc_ver1.bin
It works, the firmware gets loaded BUT now I have weird screen flickering issues...
Funny thing is, without these firmware files, it just worked flawlessly before.
Now I am irritated, as I read that it is probably a good idea having them for energy management purposes and so. As this is an ultrabook, powersavings quite matter to me.
Can anybody shed light on my issue?
This is the graphics unit:
| Code: |
00:02.0 VGA compatible controller: Intel Corporation Skylake Integrated Graphics (rev 07) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Skylake Integrated Graphics
Flags: bus master, fast devsel, latency 0, IRQ 123
Memory at de000000 (64-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [100] Process Address Space ID (PASID)
Capabilities: [200] Address Translation Service (ATS)
Capabilities: [300] Page Request Interface (PRI)
Kernel driver in use: i915
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"Coincidence is God's way of remaining anonymous."
Albert Einstein
"The road to success is always under construction"
Last edited by Martux on Sat May 21, 2016 4:55 am; edited 1 time in total |
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albright
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Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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| Posted: Tue Mar 15, 2016 12:14 pm Post subject: |
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| Quote: |
I have zapped through journalctl and stumpled upon a message stating that the integrated graphics is missing firmware files. |
sorry I can't help with your problem, but I wonder how to verify if i915 firmware
is loading or not. I do NOT use systemd and nothing shows up (apparently)
in dmesg.
My problem is that in kernel >=4.4 my monitor blanks out randomly - the blanking
lasts about 5 seconds. When it happens it is on some input (Mouse or Keyboard).
This is with broadwell graphics Broadwell-U Integrated Graphics (rev 09)
EDIT: just tried kernel 4.5.0 - the video issues are worse (after going black the backlight
blinks every few seconds, eventually the desktop returns for a brief period before the
woeful cycle starts again. My system is odd: an intel broadwell i7 nuc with a displayport
splitter feeding dual monitors but still ...)
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Martux
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| Posted: Tue Mar 15, 2016 4:47 pm Post subject: |
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Like I said, I saw the system log complaining about missing firmware files (even if fully working). Can't restore now because it logs only 2 days.
After applying the firmware, it didn't complain anymore, that's it.
But every now and then, I get something like this and it doesn't look too good:
| Code: |
Mär 15 17:30:16 ultrabook kernel: WARNING: CPU: 3 PID: 811 at drivers/gpu/drm/i915/intel_uncore.c:599 hsw_unclaimed_reg_debug+0x64/0x80()
Mär 15 17:31:19 ultrabook kernel: [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun
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This is only on the Skylake machine. The similar machin which is like a year old (pre-skylake) doesn't want any firmware... Seems like we all are having lots of fun with the Intel graphics 
What I don't get is if there is any benefit whatsoever in loading that firmware or not.
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HerbMillerJW
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Joined: 16 Feb 2012
Posts: 37
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| Posted: Wed Mar 16, 2016 5:19 am Post subject: |
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Power management for Linux on Skylake chipsets is in a really sad state right now. Try adding | Code: | | intel_pstate=disable |
to your kernel boot parameters and see if that makes the oddities go away while the firmware is loaded. This makes kernel fall back to ACPI power management, and it resolved all of my video issues (screenshots were hard-locking my system). |
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Wallsandfences
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Joined: 29 Mar 2010
Posts: 378
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| Posted: Wed Mar 16, 2016 10:31 am Post subject: |
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It's a pity that intel is either not willing or not capable to deliver a working driver/firmware for skylake. In theory, you should build | Code: | skl_dmc_ver1.bin
skl_guc_ver1.bin
skl_guc_ver4.bin |
in to your kernel and it should work. As I understand it, the dmc-part is responsible for proper power-settings inside the chip. Unfortunately, it doesn't work:
| Code: | dmesg | grep drm
[ 0.302320] [drm] Initialized drm 1.1.0 20060810
[ 0.303082] [drm] Found 128MB of eLLC
[ 0.303491] [drm] Memory usable by graphics device = 4096M
[ 0.303521] [drm] VT-d active for gfx access
[ 0.303548] fb: switching to inteldrmfb from EFI VGA
[ 0.303683] [drm] Replacing VGA console driver
[ 0.309189] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 0.309194] [drm] Driver supports precise vblank timestamp query.
[ 0.309271] [drm:csr_load_work_fn] *ERROR* Unknown stepping info, firmware loading failed
[ 0.309278] [drm:csr_load_work_fn] *ERROR* Failed to load DMC firmware, disabling rpm
[ 0.350921] [drm] failed to retrieve link info, disabling eDP
[ 0.353476] [drm] RC6 disabled, disabling runtime PM support
[ 0.359732] [drm] Initialized i915 1.6.0 20151218 for 0000:00:02.0 on minor 0
[ 0.466968] fbcon: inteldrmfb (fb0) is primary device
[ 1.150636] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 1.715303] [drm] RC6 off
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So I have to include i915.enable_rc6=0 in the kernel boot parameters. Not good for laptops, of course.
The guc-part is working (Initialized i915 etc.), I saw error-messages in dmesg (or journatlctl) when I forgot to compile the firmware in on my first attempts.
This is with kernel-4.5.0-gentoo and intel nuc i5 skylake |
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Martux
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| Posted: Wed Mar 16, 2016 4:58 pm Post subject: |
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Thank you for the explanation. That means, all we can do right now, is to wait until kernel development progresses further and at some point things will "just work"? Do I also regularly have to check if the firmware drivers will change and adjust the build in files accordingly?
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albright
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Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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| Posted: Wed Mar 16, 2016 5:35 pm Post subject: |
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while attention is on intel video issues, my logs are
filled with this:
| Quote: | | [drm:gen8_irq_handler] *ERROR* The master control interrupt lied (SDE)! |
whatever does it mean?
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Martux
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| Posted: Wed Mar 16, 2016 5:44 pm Post subject: |
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I don't know if you can make something out of this?
https://www.spinics.net/lists/intel-gfx/msg81325.html
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Strunzdesign
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Joined: 12 May 2004
Posts: 67
Location: Nuremberg - Germany
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| Posted: Sat Apr 09, 2016 2:40 pm Post subject: |
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Hi,
to fix your firmware loading issue, just edit this file:
/usr/src/linux/drivers/gpu/drm/i915/intel_csr.c (gentoo-sources-4.5.0-r1)
Add the missing stepping infos J and K at line 177:
static const struct stepping_info skl_stepping_info[] = {
{'A', '0'}, {'B', '0'}, {'C', '0'},
{'D', '0'}, {'E', '0'}, {'F', '0'},
{'G', '0'}, {'H', '0'}, {'I', '0'},
{'J', '0'}, {'K', '0'}
};
I don't remember where I found this, but it fixed firmware loading on my i5-6260U-NUC.
Regards,
Florian |
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Martux
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Joined: 04 Feb 2005
Posts: 1917
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| Posted: Sun Apr 10, 2016 7:21 pm Post subject: |
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Florian, thanks for your hint.
The firmware IS actually being loaded:
| Code: |
Apr 10 18:34:42 ultrabook kernel: [drm] Finished loading i915/skl_dmc_ver1.bin (v1.26)
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Changing the source file as you suggested and recompiling the kernel, unfortunately didn't change anything in the screens behaviour. Btw., it's flickering only after system suspend.
_________________
"Coincidence is God's way of remaining anonymous."
Albert Einstein
"The road to success is always under construction" |
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Wallsandfences
Guru
Joined: 29 Mar 2010
Posts: 378
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| Posted: Wed Apr 13, 2016 8:26 am Post subject: |
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Hi Florian,
if I do htis, I get
| Code: | [drm:csr_load_work_fn] *ERROR* Firmware has wrong CSS header length 2106439056 bytes
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Rüdiger
| Strunzdesign wrote: | Hi,
to fix your firmware loading issue, just edit this file:
/usr/src/linux/drivers/gpu/drm/i915/intel_csr.c (gentoo-sources-4.5.0-r1)
Add the missing stepping infos J and K at line 177:
static const struct stepping_info skl_stepping_info[] = {
{'A', '0'}, {'B', '0'}, {'C', '0'},
{'D', '0'}, {'E', '0'}, {'F', '0'},
{'G', '0'}, {'H', '0'}, {'I', '0'},
{'J', '0'}, {'K', '0'}
};
I don't remember where I found this, but it fixed firmware loading on my i5-6260U-NUC.
Regards,
Florian |
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Martux
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Joined: 04 Feb 2005
Posts: 1917
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| Posted: Sat May 21, 2016 4:54 am Post subject: |
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As skylake support seems to advance, some recent update in ~amd64 fixed this issue. No more flickering after resume for me 
Not exactly sure which combination of kernel, linux-firmware and xf86-video intel fixed it, though.
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