Control: tags -1 + moreinfo Hi Enrique,
On Sat, Apr 15, 2023 at 12:26:06PM +0200, Enrique Garcia wrote: > Package: src:linux > Version: 6.1.20-1 > Severity: normal > X-Debbugs-Cc: cqu...@arcor.de > > I have been running debian testing for a while and I see that from time to > time > a get a flickering screen when switching to the virtual console with Ctrl- > Alt-F1. It does occur also ocassionally when booting the laptop just before > systemctl starts printing the start messages. > I can see the following messages with journalctl: > > abr 15 11:53:10 hostname kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A > FIFO underrun > > There are other i915 related messages in the log, but it does not seem they > are > directly related to the problem: > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] VT-d active for gfx > access > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: vgaarb: deactivate vga > console > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] Using Transparent > Hugepages > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: vgaarb: changed VGA > decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] Disabling > framebuffer > compression (FBC) to prevent screen flicker with VT-d enabled > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: firmware: direct-loading > firmware i915/skl_dmc_ver1_27.bin > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] Finished loading DMC > firmware i915/skl_dmc_ver1_27.bin (v1.27) > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] [ENCODER:102:DDI > B/PHY B] is disabled/in DSI mode with an ungated DDI clock, gate it > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] [ENCODER:117:DDI > C/PHY C] is disabled/in DSI mode with an ungated DDI clock, gate it > abr 15 11:41:46 hostname kernel: [drm] Initialized i915 1.6.0 20201103 for > 0000:00:02.0 on minor 0 > abr 15 11:41:46 hostname kernel: fbcon: i915drmfb (fb0) is primary device > abr 15 11:41:46 hostname kernel: i915 0000:00:02.0: [drm] fb0: i915drmfb frame > buffer device > abr 15 11:41:47 hostname kernel: snd_hda_intel 0000:00:1f.3: bound > 0000:00:02.0 > (ops i915_audio_component_bind_ops [i915]) > abr 15 11:52:49 hostname kernel: (NULL device *): firmware: direct-loading > firmware i915/skl_dmc_ver1_27.bin > abr 15 11:53:07 hostname kernel: i915 0000:00:02.0: [drm] [ENCODER:94:DDI > A/PHY > A] is disabled/in DSI mode with an ungated DDI clock, gate it > abr 15 11:53:07 hostname kernel: i915 0000:00:02.0: [drm] [ENCODER:102:DDI > B/PHY B] is disabled/in DSI mode with an ungated DDI clock, gate it > abr 15 11:53:07 hostname kernel: i915 0000:00:02.0: [drm] [ENCODER:117:DDI > C/PHY C] is disabled/in DSI mode with an ungated DDI clock, gate it > > > Looking into the logs I can see that the problem started to appear when I > upgraded my system to testing last August. The kernel that was installed was > linux-image-5.18.0-3-amd64:amd64 (5.18.14-1, automatic) according to apt logs. > Since then the kernel has been upgraded to the 6 series but the problem > persists. > The flickering happens every couple of seconds, which makes it inconvenient to > work with the virtual console. As you say you start noticing it with 5.18.14-1, would you be able to verify it directly with 5.18.14, test as well 5.18.5 (which was the basis for the previous update 5.18.5-1) and then bisect the changes inbetween to determine the potential introducing commit? And I assume you can still reproduce the issue with upstream's 6.1.24? Regards, Salvatore
