radeon DRMKMS on Gateway M-1625

["John D. Baker" <jdbaker%consolidated.net@localhost>]

While testing other machines for PR kern/52440, I happened to boot a
Gateway M-1625 laptop.  At some point during boot, it appeared to hang
and the LCD screen slowed faded to white.

After a few rounds of booting in userconf mode and disabling various
things, the machine completed booting.  'dmesg' reveals the video card
to be:

[...]
acpivga0 at acpi0 (VGA): ACPI Display Adapter
acpiout0 at acpivga0 (CRT, 0x0100): ACPI Display Output Device
acpiout1 at acpivga0 (TV0, 0x0210): ACPI Display Output Device
acpiout2 at acpivga0 (LCD, 0x0110): ACPI Display Output Device
acpiout2: brightness levels: [12,25,37,50,62,75,87,100]
acpivga0: connected output devices:
acpivga0:   0x0100 (acpiout0): Ext. Monitor, head 0, bios detect
acpivga0:   0x0110 (acpiout2): LCD Panel, head 0, bios detect
acpivga0:   0x0210 (acpiout1): Unknown Output Device, head 0, bios detect
[...]
vga0 at pci1 dev 5 function 0: ATI Technologies product 791f (rev. 0x00)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
drm at vga0 not configured
[...]

On the next boot (w/userconf) disabling "radeon" was sufficient to let
booting complete.

Rebooting normally, the problem seems to occur just after "/" is available
and it tries to load firmware.  The machine is stuck at that point and the
screen has faded to all white.  I can press Ctrl-Alt-Esc, get in to DDB,
blind-type "reboot" and the machine reboots.

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