From: Arjan van de Ven <arjan@linux.intel.com>
To: Larry Finger <Larry.Finger@lwfinger.net>,
LKML <linux-kernel@vger.kernel.org>,
Li Aubrey <aubrey.li@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>
Cc: Porteus Kiosk <porteus.kiosk@gmail.com>,
Bastien Nocera <hadess@hadess.net>,
Avi Weiss <aviw@benchmarkmerchantsolutions.com>,
Benny Silberstein <bennys@benchmarkmerchantsolutions.com>
Subject: Re: V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL is set, bisected to commit 7486341
Date: Sat, 11 Jul 2015 11:21:07 -0700 [thread overview]
Message-ID: <55A15E93.8070706@linux.intel.com> (raw)
In-Reply-To: <55A1598A.5040903@lwfinger.net>
On 7/11/2015 10:59 AM, Larry Finger wrote:
> On a Winbook TW100 BayTrail tablet, kernel 4.0 and later do not create /dev/rtc0 when CONFIG_PINCTRL_BAYTRAIL is set in the configuration. Removing this option from the
> config creates a real-time clock; however, it is no longer possible to get the tablet to sleep using the power button. Only complete shutdown works.
>
> This problem was bisected to the following commit:
in "hardware reduced mode" (e.g. tablets) on Baytrail the RTC is not actually enabled/initialized by the firmware; talking to it may appear to work but it's really not
a good idea (and breaks things likes suspend/resume etc).
next prev parent reply other threads:[~2015-07-11 18:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-11 17:59 V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL is set, bisected to commit 7486341 Larry Finger
2015-07-11 18:21 ` Arjan van de Ven [this message]
2015-07-11 18:22 ` Arjan van de Ven
[not found] ` <CANC45uWh5-jYLqoFgvfynC0n7t31fae1gp2DUn-bwky24trAPg@mail.gmail.com>
2015-07-11 18:35 ` Arjan van de Ven
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