Gather information about regression on some Intel GPU (Braswell, Kaby Lake)

Well, since Tails 3.12, many users have been complaining that they get the “Error starting GDM” issue, and finally I got answers confirming that there hardware were working fine with Tails 3.11, so that’s a regression.

Here is the list of affected GPU that were working fine with 3.11:

• Intel Corporation Atom/Celeron/Pentium Precessor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller [8086:22b1] (rev 35) - (2 reports)
• Intel Corporation 82915G/GV/940GL: integrated Graphics controller [8086:2582] (rev 04)

Here is the list of potential regression (not sure about 3.11 behavior):

• Integrated Graphics Controller [8086:0a16] (rev0b)
• Intel Corporation HD Graphics 630 [8086:591b] (rev 04) - (4 reports) → GDM fails to start in troubleshooting mode on 3.13.2; with troubleshooting mode and xorg-driver=modesetting, it fails to start because /dev/dri/card0 does not exist (expected since troubleshooting mode sets nomodeset; note that the nouveau driver is also loaded
• Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) → GDM fails to start in troubleshooting mode on 3.14.2 (3.14 booted fine); fixed by passing either one of xorg-driver=intel or xorg-driver=modesetting for one user; contradictory report that says xorg-driver=modesetting is not sufficient on the same hardware

And from the few users who answered back, none of the following workaround works:

https://tails.boum.org/support/known_issues/graphics/#index3h2

Attachments

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Related issues

• Related to #16224 (closed)
• Related to #16552 (closed)

Original created by @mercedes508 on 16447 (Redmine)