OK, I've filed a bug at
https://gitlab.freedesktop.org/drm/intel/-/issues/2145
I'll keep this bug report updated.
** Bug watch added: gitlab.freedesktop.org/drm/intel/-/issues #2145
https://gitlab.freedesktop.org/drm/intel/-/issues/2145
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According to the lspcon chip datasheet, there's an optional reset pin
that can reset the chip. I wonder if it's not being used under Linux.
Anyway, please file an upstream bug at Intel graphics upstream:
https://gitlab.freedesktop.org/drm/intel/wikis/How-to-file-i915-bugs
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Just to add to my previous comment, I see that if I remove HDMI cable
and reconnect it again, I 'always' get lspcon error. If I need external
monitor, I need to restart the machine.
** Attachment added: "dmesg_hdmi_reconnect.txt"
I recently purchased Thinkpad P1 Gen2(Intel® Core™ i7-9850H CPU @ 2.60GHz × 12
with Mesa Intel® UHD Graphics 630 (CFL GT2))
I have latest Ubuntu 20.04 installed. (5.4.0-40-generic #44-Ubuntu SMP Tue Jun
23 00:01:04 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux)
I am seeing issues with an external
Re. the bug report in the email thread, they state that "if HDMI cable
isn't plugged before boot, the HDMI port becomes useless and never
responds to cable hotplugging"
However my situation seems to be the reverse: If the HDMI cable is
plugged in before cold boot, then the port appears to work
The patch did not fix the issue. However, during boot, some error text
appeared that did not appear before:
[1.868916] [drm:drm_lspcon_set_mode [drm_kms_helper]] *ERROR* LSPCON mode
change timed out
[1.868970] [drm:lspcon_change_mode.constprop.0 [i915]] *ERROR* LSPCON mode
change failed
Can you please test this patch:
https://lore.kernel.org/lkml/20200610075542.12882-1-kai.heng.f...@canonical.com/
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https://bugs.launchpad.net/bugs/1886230
Title:
Thinkpad
Should I report this to upstream instead?
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https://bugs.launchpad.net/bugs/1886230
Title:
Thinkpad P1 Gen2 HDMI doesn't work after log out or reboot
Status in linux
Tested on stock Ubuntu kernel 5.4.0, then 5.7.7, then 5.8.0-rc3 with
same results.
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https://bugs.launchpad.net/bugs/1886230
Title:
Thinkpad P1 Gen2 HDMI doesn't work after
Hi, please test mainline builds:
https://wiki.ubuntu.com/Kernel/MainlineBuilds
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https://bugs.launchpad.net/bugs/1886230
Title:
Thinkpad P1 Gen2 HDMI doesn't work after log
Note, this occurs in both Wayland and X. Thus I think it's probably a
kernel issue.
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Title:
Thinkpad P1 Gen2 HDMI doesn't work
dmesg output after reboot, and HDMI is broken
** Attachment added: "dmesg-broken-post-reboot"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886230/+attachment/5389518/+files/dmesg-broken-post-reboot
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dmesg output when HDMI is working
** Attachment added: "dmesg-working"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886230/+attachment/5389517/+files/dmesg-working
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xrandr output when HDMI is working correctly
** Attachment added: "xrandr-working"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886230/+attachment/5389515/+files/xrandr-working
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xrandr output after the bug occurs (i.e. HDMI is broken)
** Attachment added: "xrandr-broken"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886230/+attachment/5389516/+files/xrandr-broken
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