Hello, I'm using Dell TB dock to connect external monitor. fwupd service, that checks for hardware components creates an extra fake monitor to probe information when MST controller is powered up without a monitor plugged in. That causes a series of flickers caused by the kernel graphics driver. I've been asked to create this bug by fwupd maintainers as they believe it's "i915 not handling the fake monitor well". See: https://github.com/hughsie/fwupd/issues/1105#issuecomment-476206640 for details. Technical details (from https://01.org/linuxgraphics/documentation/how-report-bugs): uname -m: x86_64 uname -r: 5.0.9-arch1-1-ARCH Linux distribution: Arch Machine or mother board model: Dell XPS 13 9350 Display connector: DP through Thunderbolt dock. If there is more info needed please do tell me. Sorry in advance if I did miss something!
Can you please attach the dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M? Have you verified the issue with latest drmtip(https://cgit.freedesktop.org/drm-tip)?
Created attachment 144088 [details] dmesg output with drm.debug=0x1e log_buf_len=4M
> Have you verified the issue with latest drmtip(https://cgit.freedesktop.org/drm-tip)? Nope, I didn't. I actually never did that. Is there a guide how to do that? In the mean time I'll try to look for it in documentation (https://cgit.freedesktop.org/drm-tip/tree/Documentation).
(In reply to Wiktor from comment #3) > > Have you verified the issue with latest drmtip(https://cgit.freedesktop.org/drm-tip)? > > Nope, I didn't. I actually never did that. Is there a guide how to do that? > In the mean time I'll try to look for it in documentation > (https://cgit.freedesktop.org/drm-tip/tree/Documentation). Wiktor, this should help you https://01.org/linuxgraphics/documentation/build-guide-0 to build drmtip.
@Wiktor, Any results from drmtip?
@Lakshmi, terribly sorry for the delay. Apparently I have grossly underestimated the amount of work I'd have in May. I'll get back to this ticket as soon as possible, as I don't like half-open tickets.
No test results from drmtip for more than a month. Closing this issue as resolved works for me. Please re-open if issue persists with latest drm-tip https://cgit.freedesktop.org/drm-tip and send dmesg from boot with kernel parameters drm.debug=0x1e log_buf_len=4M?
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