The latest mainline kernel (commit 3f59de0) shows a regression. The symptom is
that as soon as the kernel is started, the display is blanked, and it is never
turned on again. This problem was bisected to commit
f21a21983ef13a031250c4c3f6018e29a549d0f1
("drm/i915: Splitting intel_dp_detect"). The adapter in question is the
integrated graphics controller on a Toshiba Tecra A50 laptop. The output of
"lspci -nnv" for that controller is as follows:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA
controller])
Subsystem: Toshiba America Info Systems Device [1179:0002]
Flags: bus master, fast devsel, latency 0, IRQ 27
Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915
New information: I have used SSH to connect to the laptop to see the logs. In
the dmesg output, I see "i915 0000:00:02.0: No connectors reported connected
with modes". I will try to determine why that is happening.
Larry
