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Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4

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  Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4 Guilherme Ritter <gui.a.ritter@gmail.com> - 2018-01-14 14:10 +0100
    Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4 Marco <marcods@gmx.net> - 2018-01-16 09:30 +0100
      Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4 Robin Gareus <robin@gareus.org> - 2018-01-24 03:10 +0100
    Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4 Guilherme Ritter <gui.a.ritter@gmail.com> - 2018-03-25 16:00 +0200

#59977 — Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4

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Me too. I asked about this here (there's a video):

https://superuser.com/questions/1277194/screen-glitching-when-mousepad-is-tapped-or-keyboard-is-pressed

Happens in linux-image-4.9.0-4-amd64 and linux-image-4.9.0-5-amd64, haven't
happened so far in linux-image-4.9.0-3-amd64.

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#60005

The same is happening here on Dell XPS13 with linux-image-4.9.0-4-amd64 
and linux-image-4.9.0-5-amd64, had to move back to 4.9.0-3. The 
flickering starts randomly when keyboard or mouse is used. The 
flickering stops when I use the touchpad, then starts again when I lift 
my finger. I have to touch it a few times to make it stop completely.

00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 
(rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller 
(rev 09)
00:04.0 Signal processing controller: Intel Corporation Broadwell-U 
Processor Thermal Subsystem (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI 
Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI 
Controller #1 (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition 
Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root 
Port #1 (rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root 
Port #4 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI 
Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller 
(rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA 
Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP 
Thermal Management Controller (rev 03)
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 
PCI Express Card Reader (rev 01)
02:00.0 Network controller: Broadcom Limited BCM4352 802.11ac Wireless 
Network Adapter (rev 03)

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#60061

The recent backport kernel does *not* have this issue. All is fine with

 4.14.0-0.bpo.3-amd64 #1 SMP Debian 4.14.13-1~bpo9+1 (2018-01-14)

This is on a Thinkpad X250 with 00:02.0 VGA compatible controller: Intel
Corporation HD Graphics 5500 (rev 09)

4.9.0-4-amd64 and 4.9.0-5-amd64 on the same box do cause screen flickering.



Chances are that the issue was introduced by the update to upstream
4.9.46. There are a handful of "drm/i915" changes:

https://anonscm.debian.org/git/kernel/linux.git/commit/?h=debian/4.9.65-3%2bdeb9u2&id=17811b5a4b11b32307baca3b88067398a1168cfb

"Workaround VLV/CHV DSI scanline counter hardware fail" sounds
suspicious, but that's just a guess.

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#60555

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So far, linux-image-4.9.0-6-amd64​ seems to have fixed it for me.

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