iris driver for old cpu

[Chenxi Wu]

I am not completely sure where I should file the bug. I am using Lubuntu 20.04 with lxqt, and since the upgrade to 20.04 iris is the default graphics driver, which results in crashes in multiple apps including guvcview and calibre. Setting MESA_LOADER_DRIVER_OVERRIDE=i965 fixed the problem. I am not sure but is it true that iris does not support older generations of Intel CPUs? If it is the case would it be possible to revert to i965 in those circumstances? Thanks!

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Timo Aaltonen (tjaalton)]

file bugs upstream at
https://gitlab.freedesktop.org/mesa/mesa

iris supports intel gpu's gen8 and up (meaning broadwell and newer)

[Chenxi Wu (wuchenxi2013)]

Thanks! Mine is gen6 so the problem is with the default choice of graphics driver, do you happen to know which source package I should file bug or feature request to? Thanks again!

[Timo Aaltonen (tjaalton)]

you should not be using iris then, since it doesn't support (meaning it won't load on) gen6

[Chenxi Wu (wuchenxi2013)]

Sorry I wasn't clear! Yes I realized that after Googling and switched to i965 and it's fixed, I am just wondering if the package responsible for choosing the default driver can add a check for older CPU model so that this problem will not be encountered by other users. I think I should probably file this to the installer or upgrader instead!

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

could be a dupicate of bug #1871959

[Lukas Hejtmanek (xhejtman)]

Whiskey Lake is also affected, guess it is gen8?

[arno (star-gmx)]

For me (core m5 6th generation) I noticed that mpv/celluloid is crashing after an update of ubuntu mate 20.04. Could reproduce by reinstalling (works) and update (crash). Unfortunatly I don't know what and how to revert.

[arno (star-gmx)]

For those wo asking where to set
Adding this line to ~/.profile helps for me as workaround.
"export MESA_LOADER_DRIVER_OVERRIDE=i965"

But this is a severe bug and should be fixed. I am curious what change caused this?

[Lahfa Samy (akechishiro)]

I have an Intel I7-5600U on PopOS 20.04 (note this distribution that is based on Ubuntu 20.04 is not listed in the `also affects distribution/package` and I'm currently affected by this bug as well.
Same here, I'm curious to what change has caused this bug.

[arno (star-gmx)]

@akechishiro: Did the above mentioned workaround works for you?

[Lahfa Samy (akechishiro)]

@star-gmx : The above did work for me (but I only tried setting the variable before the command such as "VARIABLE=value command"), setting this variable MESA_LOADER_DRIVER_OVERRIDE=i965 for anything that uses the MESA driver, stops segmentation faults from happening.

[arno (star-gmx)]

What command beside mpv/Celluloid are suffered at your side?

[Lahfa Samy (akechishiro)]

So far vlc/Vlc Media Player and this specific terminal https://github.com/Swordfish90/cool-retro-term.

[arno (star-gmx)]

This bug disappears if I go back from intel x driver to standard modesetting driver. I didn't to that intenionally. I haven't been aware of that, but to get xbacklight working (to change screen brightness) I activated that. After removing that change in /etc/X11 mpv/celluloid works without this variable.

[K van Murfi (christophe-courtois)]

Same problem here (Ubuntu 20.04, i915 driver, Skylake Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz
) :
- glxgears and vlc both give a black window
- /usr/bin/kcmshell5 kcm_networkmanagement returns a segfault.

'export MESA_LOADER_DRIVER_OVERRIDE=i965' seems to solve all this. Many thanks to Chenxi Wu for this trick.

[Sebastian Ramacher (s-ramacher)]

Broken driver or invalid driver selection is nothing we can fix in vlc.

[Linux Admin (8tomato)]

After upgrade to Ubuntu 20.04 most KDE native apps are now crashing and this includes systemsettings5. segfault stacktrace points to crash in /usr/lib/x86_64-linux-gnu/dri/iris_dri.so

> inxi -G
Graphics: Device-1: Intel HD Graphics 530 driver: i915 v: kernel
           Display: x11 server: X.Org 1.20.8 driver: intel resolution: 3440x1440~60Hz
           OpenGL: renderer: Mesa Intel HD Graphics 530 (SKL GT2) v: 4.6 Mesa 20.1.8

xserver-xorg-video-intel version 2:2.99.917+git20200226-1

Setting MESA_LOADER_DRIVER_OVERRIDE=i965 does resolve this issue completely, however I am wondering why this is not selected automatically if iris driver does not support my GPU.

[Timo Aaltonen (tjaalton)]

there is no mechanism to detect that you're using the non-supported -intel driver

[themusicgod1 (themusicgod1)]

pretty sure this isn't a ring/jami bug

[Oibaf (oibaf)]

Ubuntu 20.04 now has mesa version 21.2.6-0ubuntu0.1~20.04.2, newer than the 20.1.8 where 8tomato last confirmed the bug.
Can you update and check if the issue is still reproducible?

[Oibaf (oibaf)]

Given the issue does not reproduce with MESA_LOADER_DRIVER_OVERRIDE=i965 it is not likely a xserver-xorg-video-intel bug.