Hi, I recently installed LL 4.8 on an old HP Compaq 6710b laptop. It installed perfectly fine and I'm currently writing this post from there, so it works fine and fast once logged in. But every time I boot (no dual boot, LL only) it takes a lot of time to reach to desktop. Similarly when I shut down, it takes some time to do it, more than it should.
So I've taken a look to dmesg and have found that there is some problem than repeats over boot time (and also at shutdown) and slows things down a lot:
q-6710b-GB889ET-ABE kernel: [ 13.280068] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:34:pipe A] flip_done timed out
Apr 1 21:52:52 HP-Compaq-6710b-GB889ET-ABE kernel: [ 13.384046] ------------[ cut here ]------------
Apr 1 21:52:52 HP-Compaq-6710b-GB889ET-ABE kernel: [ 13.384047] vblank wait timed out on crtc 0
Apr 1 21:52:52 HP-Compaq-6710b-GB889ET-ABE kernel: [ 13.384120] WARNING: CPU: 0 PID: 91 at /build/linux-ZcR2Eb/linux-4.15.0/drivers/gpu/drm/drm_vblank.c:1081 drm_wait_one_vblank+0x188/0x190 [drm]
What do you think?