I booted with drm.debug=14 and looked at the output of dmesg. It had lines like
[0.717202] [drm:i915_dump_device_info] i915 device info: gen=7,
pciid=0x0412 rev=0x06
flags=need_gfx_hws,is_haswell,has_fbc,has_hotplug,has_llc,has_ddi,has_fpga_dbg,
...
[0.938640]
Seems to have gotten worse with the next batch of updates
(linux-image-4.4.0-47-generic:amd64); now it won't show a screen at all, even
when booting to multiuser, after the kernel sets the
graphics mode. Works fine if I give nomodeset, but then I can't use
accelerated graphics.
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