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==Additional information and hints== | ==Additional information and hints== | ||
- | + | # The stock Nokia kernel uses the following frequencies: 250, 500, 550 and 600 MHz. | |
- | + | # The CPU does '''NOT IDLE''' at the lowest frequency (250 MHz) but it '''SLEEPS''' at 0 MHz! Thus, reducing the lowest frequency would not reduce power consumption. It is only activated during low workload and may actually consume more power than a higher frequency, as it takes more time to go back to sleep/idle state. | |
- | + | # Setting the lowest frequency to 125 MHz does NOT improve battery life. In fact, many people noticed worse battery life, instability and worse responsiveness, | |
- | + | # The Phone app is closed-source and broken. During a phone call, the device's frequency [http://talk.maemo.org/showpost.php?p=601691&postcount=1823 is locked to 600MHz]. This may be a bug, and it affects all kernels for Fremantle. After a phone call, it sets the maximum to 600 Mhz and the minimum to 250 MHz (or 125 MHz if available) regardless of the frequencies you have set. There are some workarounds present in kernel-power, however the bug may still occasionally manifest. | |
- | + | # when connected via USB the device locks the minimum frequency to 500 Mhz. | |
- | + | # By default the device is configured to use 125 MHz as the lowest frequency but it not enabled in the kernel [https://bugs.maemo.org/show_bug.cgi?id=7116 pmconfig bug] | |
- | + | # The warning <pre>WARNING: at arch/arm/mach-omap2/clock34xx.c:443 omap3_noncore_dpll_set_rate+0x28c/0x2dc()</pre> in the kernel logs (dmesg) only happens if the invalid 800 MHz frequency was selected. Ignore it. | |
- | + | # EvilJazz had photoshopped a [http://talk.maemo.org/showpost.php?p=605523&postcount=90 picture of a device being overclocked 1.7GHz]. It's a '''prank'''! | |
- | + | # The internal temperature sensor may be read by using the command "cat /sys/devices/platform/omap34xx_temp/temp1_input" | |
- | + | '''Note that the system does not have an on-die temperature sensor, and the actual CPU temperature may be higher or lower than the reading.''' | |
==Installing a modified kernel== | ==Installing a modified kernel== |
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