Created attachment 137470 [details] 4.15.4 log ThinkPad X1 Carbon 4th Gen running i7-6600u Skylake Displays connected to ThinkPad OneLink Plus Dock work in bios/grub and on kernel version 4.14.20, but fail to light up on kernel 4.15.4 drm.debug=0xe logs attached available firmwares: /lib/firmware/i915/skl_huc_ver01_07_1398.bin /lib/firmware/i915/skl_guc_ver9_33.bin /lib/firmware/i915/skl_guc_ver6_1.bin /lib/firmware/i915/skl_dmc_ver1_26.bin
Created attachment 137471 [details] 4.14.20 log
Same error, when booting the T460S with the latest kernel update. VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07) kernel-4.15.3-300.fc27.x86_64
Same error here as well on T470 with the latest kernel update on Fedora. kernel-4.15.3-300.fc27.x86_64 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02
Had a similar problem. I applied this patch [0] and the blank screens eventually turned on after boot (takes about 30s - don't know why). Probably worth a try. [0] https://patchwork.freedesktop.org/patch/210500/
First of all. Sorry about spam. This is mass update for our bugs. Sorry if you feel this annoying but with this trying to understand if bug still valid or not. If bug investigation still in progress, please ignore this and I apologize! If you think this is not anymore valid, please comment to the bug that can be closed. If you haven't tested with our latest pre-upstream tree(drm-tip), can you do that also to see if issue is valid there still and if you cannot see issue there, please comment to the bug.
(In reply to Jani Saarinen from comment #5) > First of all. Sorry about spam. > This is mass update for our bugs. > > Sorry if you feel this annoying but with this trying to understand if bug > still valid or not. > If bug investigation still in progress, please ignore this and I apologize! > > If you think this is not anymore valid, please comment to the bug that can > be closed. > If you haven't tested with our latest pre-upstream tree(drm-tip), can you do > that also to see if issue is valid there still and if you cannot see issue > there, please comment to the bug. I just checked the latest kernels again: 4.14.31 - still working 4.15.14 - still failing 4.16-rc7 - working again! I don't know how to track which drm-tip commits made it into mainline kernel, but seems like the fix needs to be committed to the 4.15 stable branch.
Thank you for the update. I'm closing then, if problem returns please mark as REOPEN.
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