Description of problem:
Tried booting with a new (current) kernel.
I can boot fine-ish with 4.14.11-300.fc27.x86_64 (hardware acceleration does not seem to work as glxinfo only reports llvime OpenGL driver), but even later (current) fc27 kernels (4.15-ish) would hang.
Same thing with fc28 beta now.
I have a ThinkPad T420 with Nvidia Optimus. I'll need to (re-)test if enabling/disabling Optimus and/or enablind/disabling the Intel VT-d in BIOS and similar tricks help.
WARNING: CPU: 0 PID: 117 at drivers/gpu/drm/drm_vblank.c:1073 drm_wait_one_vblank+0x166/0x180 [drm]
Modules linked in: i915 nouveau crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel mxm_wmi ttm i2c_algo_bit drm_kms_helper sdhci_pci serio_raw cqhci sdhci e1000e mmc_core drm ptp pps_core wmi video
CPU: 0 PID: 117 Comm: kworker/u16:3 Not tainted 4.16.0-300.fc28.x86_64 #1
Hardware name: LENOVO 4178A9G/4178A9G, BIOS 83ET76WW (1.46 ) 07/05/2013
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:drm_wait_one_vblank+0x166/0x180 [drm]
RSP: 0018:ffffa032020f7940 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff880666fe8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000202
RBP: 0000000000000000 R08: 0000000988538205 R09: 000000000000001f
R10: 6f2074756f206465 R11: 302063747263206e R12: 0000000000000000
R13: 0000000000000039 R14: ffff8806695e6c08 R15: ffff880666fe8000
FS: 0000000000000000(0000) GS:ffff88067e200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed20197370 CR3: 00000002b920a005 CR4: 00000000000606f0
? __drm_fb_helper_initial_config_and_unlock+0x213/0x420 [drm_kms_helper]
? intel_fbdev_initial_config+0x14/0x30 [i915]
Code: db f8 0f 0b e9 2d ff ff ff 48 89 e6 4c 89 f7 e8 71 08 e0 f8 45 85 e4 0f 85 0f ff ff ff 89 ee 48 c7 c7 40 b0 30 c0 e8 a4 c2 db f8 <0f> 0b e9 fa fe ff ff e8 2e c0 db f8 0f 1f 40 00 66 2e 0f 1f 84
Created attachment 1418339 [details]
Indeed, when I disabled Nvidia Optimus and Intel VT-d I could at least boot the system, although OpenGL would still fall back to llvmpipe.
But with the current kernel 4.16.1-300.fc28.x86_64 I can re-enable Optimus (+Optimus OS detection) and VT-d and boot the system successfully and even get proper OpenGL support on both GPUs.
The only small glitch/issue is that now the bootsplash resolution / aspect ratio is not correct. The resolution is too low for my 1600 x 900 display and the aspect ratio is probably 4:3 stretched to my display's 16:9. (I'm ashamed to even mention this.)
Anyways, I like the progress. Years ago I could not boot Fedora on this laptop without ACPI workarounds, turning off Optimus and VT-d and now it's working out of the box. Good work!
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