[Now sent from a subscribed address] Hi, Upgrading an Acer Chromebook C740 from a stable 5.14.18 to a 5.15.2 kernel leads to a hang/crash very early during startup. With 5.15.2, the kernel fails before any video output and bootup continues to the recovery kernel. Bisecting points to commit a22c074fd1dd52a8b41dd6789220409b64093e9c "Merge tag 'drm-intel-next-2021-08-10-1' of git://anongit.freedesktop.org/drm/drm-intel into drm-next" as the culprit, but here the symptoms are slightly different, as bootup just hangs and no fallback to the recovery kernel happens. Lspci says that the graphics chipset is a: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics (rev 08) # dmesg | grep -e "\(drm\)\|\(i915\)" [ 0.335241] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0 [ 0.335604] [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 1 [ 0.341795] fbcon: i915 (fb0) is primary device [ 1.650456] i915 0000:00:02.0: [drm] fb0: i915 frame buffer device Both parents of a22c074fd1dd52a8b41dd6789220409b64093e9c: cb22f12f302584a974a68034350bd48798843ffc and 3bfa7d40ce736ffbbfe07127061f54b359ee2b12 boots and provides video output without any problems. I would be grateful for suggestions on how to debug this further. Regards, --Frej Drejhammar
