Indan Zupancic
951f3512db
drm/i915: Do not handle backlight combination mode specially ...
The current code does not follow Intel documentation: It misses some things
and does other, undocumented things. This causes wrong backlight values in
certain conditions. Instead of adding tricky code handling badly documented
and rare corner cases, don't handle combination mode specially at all. This
way PCI_LBPC is never touched and weird things shouldn't happen.
If combination mode is enabled, then the only downside is that changing the
brightness has a greater granularity (the LBPC value), but LBPC is at most
254 and the maximum is in the thousands, so this is no real functional loss.
A potential problem with not handling combined mode is that a brightness of
max * PCI_LBPC is not bright enough. However, this is very unlikely because
from the documentation LBPC seems to act as a scaling factor and doesn't look
like it's supposed to be changed after boot. The value at boot should always
result in a bright enough screen.
IMPORTANT: However, although usually the above is true, it may not be when
people ran an older (2.6.37) kernel which messed up the LBPC register, and
they are unlucky enough to have a BIOS that saves and restores the LBPC value.
Then a good kernel may seem to not work: Max brightness isn't bright enough.
If this happens people should boot back into the old kernel, set brightness
to the maximum, and then reboot. After that everything should be fine.
For more information see the below links. This fixes bugs:
http://bugzilla.kernel.org/show_bug.cgi?id=23472
http://bugzilla.kernel.org/show_bug.cgi?id=25072
Signed-off-by: Indan Zupancic <[email protected] >
Tested-by: Alex Riesen <[email protected] >
Signed-off-by: Linus Torvalds <[email protected] >
2011-02-21 15:25:43 -08:00
Merge branch 'iomem' into release
2011-02-15 15:25:48 -05:00
libata: set queue DMA alignment to sector size for ATAPI too
2011-01-28 03:16:20 -05:00
ATM, Solos PCI ADSL2+: Don't deref NULL pointer if net_ratelimit() and alloc_skb() interact badly.
2011-02-13 16:55:46 -08:00
PM / Runtime: Don't enable interrupts while running in_interrupt
2011-01-25 20:50:07 +01:00
nbd: remove module-level ioctl mutex
2011-02-11 16:12:20 -08:00
Bluetooth: add Atheros BT AR9285 fw supported
2011-01-26 15:23:05 -02:00
cdrom: support devices that have check_events but not media_changed
2011-02-09 14:22:37 +01:00
Revert "tpm_tis: Use timeouts returned from TPM"
2011-02-20 10:03:12 -08:00
drivers/clocksource/tcb_clksrc.c: fix init sequence
2011-01-26 10:50:04 +10:00
kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT
2011-01-20 17:02:05 -08:00
Merge branch 'cpuidle-perf-events' into idle-test
2011-01-12 18:06:19 -05:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2011-01-13 10:25:58 -08:00
dca: remove unneeded NULL check
2011-01-13 08:03:09 -08:00
Merge branch 'imx' into dmaengine-fixes
2011-02-14 02:40:46 -08:00
amd64_edac: Fix DIMMs per DCTs output
2011-02-10 14:41:49 +01:00
Merge branches 'fixes' and 'fwnet' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
2011-01-21 13:34:39 -08:00
x86, dmi, debug: Log board name (when present) in dmesg/oops output
2011-02-15 04:20:57 +01:00
drivers/gpio/pca953x.c: add a mutex to fix race condition
2011-02-11 16:12:20 -08:00
drm/i915: Do not handle backlight combination mode specially
2011-02-21 15:25:43 -08:00
kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT
2011-01-20 17:02:05 -08:00
hwmon: (lm85) extend to support EMC6D103 chips
2011-02-18 17:43:36 -08:00
i2c: Encourage move to dev_pm_ops by warning on use of legacy methods
2011-01-14 22:03:50 +01:00
kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT
2011-01-20 17:02:05 -08:00
fix a shutdown regression in intel_idle
2011-01-25 05:57:34 +10:00
Merge branches 'nes' and 'qib' into for-next
2011-02-17 14:04:59 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2011-02-15 09:40:27 -08:00
isdn: hisax: Use l2headersize() instead of dup (and buggy) func.
2011-02-15 12:18:09 -08:00
leds: leds-pwm: return proper error if pwm_request failed
2011-01-26 10:49:58 +10:00
lguest: compile fixes
2011-01-20 21:37:29 +10:30
powerpc/macintosh: Fix wrong test in fan_{read,write}_reg()
2011-01-21 14:08:34 +11:00
FIX: md: process hangs at wait_barrier after 0->10 takeover
2011-02-08 11:49:02 +11:00
Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
2011-02-02 17:52:19 -08:00
workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'
2011-02-16 17:48:59 +01:00
[SCSI] mptfusion: Bump version 03.04.18
2011-02-12 12:51:21 -06:00
mfd: ab8500-core chip version cut 2.0 support
2011-01-14 12:38:18 +01:00
workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'
2011-02-16 17:48:59 +01:00
ARM: mmci: round down the bytes transferred on error
2011-01-31 10:53:37 +00:00
workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'
2011-02-16 17:48:59 +01:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
2011-02-18 14:15:05 -08:00
drivers/nfc/pn544.c: fix min_t warnings
2011-01-16 17:28:21 -08:00
dt/flattree: Return virtual address from early_init_dt_alloc_memory_arch()
2011-01-15 22:01:58 -07:00
parport: make lockdep happy with waitlist_lock
2011-01-26 10:49:59 +10:00
pci: use security_capable() when checking capablities during config space read
2011-02-15 19:06:31 +11:00
kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT
2011-01-20 17:02:05 -08:00
dell-laptop: Toggle the unsupported hardware killswitch
2011-02-21 17:06:21 -05:00
Merge branch 'pnp' into release
2011-01-12 04:59:44 -05:00
Merge git://git.infradead.org/battery-2.6
2011-01-14 09:25:59 -08:00
pps: claim parallel port exclusively
2011-01-26 10:50:00 +10:00
rapidio: fix new kernel-doc warnings
2011-01-22 20:32:37 -08:00
regulator: Support MAX8998/LP3974 DVS-GPIO
2011-01-14 12:38:16 +01:00
Merge branch 'rtc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-02-18 14:20:46 -08:00
[S390] dasd: correct device table
2011-02-17 13:13:58 +01:00
[SCSI] qla2xxx: Return DID_NO_CONNECT when FC device is lost.
2011-02-15 11:12:17 -06:00
SFI: use ioremap_cache() instead of ioremap()
2011-01-11 23:27:25 -05:00
sh: update INTC to clear IRQ sense valid flag
2011-01-19 19:02:35 +09:00
spi/pxa2xx pci: fix the release - remove race
2011-02-15 13:25:36 -07:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
2011-02-08 12:03:54 -08:00
Merge branch 'staging-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
2011-02-10 12:19:23 -08:00
[SCSI] target: fix use after free detected by SLUB poison
2011-02-12 12:32:41 -06:00
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2011-01-13 10:05:56 -08:00
Merge branch 'misc' into release
2011-01-12 05:14:15 -05:00
Merge branch 'fixes-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2011-02-18 12:36:06 -08:00
USB: cdc-acm: Adding second ACM channel support for Nokia N8
2011-02-04 12:38:14 -08:00
vhost: rcu annotation fixup
2011-02-01 16:48:46 +02:00
console: rename acquire/release_console_sem() to console_lock/unlock()
2011-01-26 10:50:06 +10:00
virtio: remove virtio-pci root device
2011-01-20 21:37:30 +10:30
drivers/w1/masters/omap_hdq.c: add missing clk_put
2011-02-11 16:12:20 -08:00
m68knommu: Rename m548x_wdt.c to m54xx_wdt.c
2011-02-08 15:07:45 +10:00
xen: suspend and resume system devices when running PVHVM
2011-02-17 10:31:20 +00:00
[SCSI] target: Add LIO target core v4.0.0-rc6
2011-01-14 10:12:29 -06:00
Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
2011-01-20 16:39:23 -08:00
951f3512db